cmake_minimum_required(VERSION 2.8.7) project(LibA NONE) function(check_variable var_name expected_value) if(NOT "x${${var_name}}" STREQUAL "x${expected_value}") message(FATAL_ERROR "Problem with mark_as_superbuild() - CMake variable [${var_name}] is incorrectly set !\n" "current:${${var_name}}\n" "expected:${expected_value}") endif() endfunction() check_variable(LibA_VAR "LibA") check_variable(LibA_EP_LABEL_LABEL_A "LibA_VAR_WITH_LABELS")